I use my 4 rigs (desktop in specs, X31, T40, T400) to keep my room warm, it significantly warmer than the rest of the floor. I'm not convinced the laptops do much (@~40w each), but they add some extra PPD and they are bound to help some. Every time my mom comes in she wants to why it is so hot

We got somewhere around 18" of snow last night and the temps are supposed to drop below zero tonight. Between the outdoor wood burner, the indoor fireplace, and the electric heater in the computer room (my rig) we should be just fine.

If only I could figure out how to get the outdoor wood burner to crunch.